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4d5ef8fb85
We sometimes create intermediate subtract instructions during reassociation. Adding these to the worklist to revisit exposes many additional reassociation opportunities. Patch by Aditya Nandakumar. llvm-svn: 253240
45 lines
1.1 KiB
LLVM
45 lines
1.1 KiB
LLVM
; RUN: opt -reassociate -S < %s | FileCheck %s
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declare void @use(float)
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define void @test1(float %x, float %y) {
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; CHECK-LABEL: test1
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; CHECK: fmul fast float %y, %x
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; CHECK: fmul fast float %y, %x
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; CHECK: fsub fast float %1, %2
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; CHECK: call void @use(float %{{.*}})
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; CHECK: call void @use(float %{{.*}})
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%1 = fmul fast float %x, %y
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%2 = fmul fast float %y, %x
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%3 = fsub fast float %1, %2
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call void @use(float %1)
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call void @use(float %3)
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ret void
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}
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define float @test2(float %x, float %y) {
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; CHECK-LABEL: test2
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; CHECK-NEXT: fmul fast float %y, %x
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; CHECK-NEXT: fmul fast float %y, %x
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; CHECK-NEXT: fsub fast float %1, %2
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; CHECK-NEXT: ret float %3
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%1 = fmul fast float %x, %y
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%2 = fmul fast float %y, %x
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%3 = fsub fast float %1, %2
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ret float %3
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}
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define float @test3(float %x, float %y) {
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; CHECK-LABEL: test3
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; CHECK-NEXT: %factor = fmul fast float %x, 2.000000e+00
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; CHECK-NEXT: %tmp1 = fmul fast float %factor, %y
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; CHECK-NEXT: ret float %tmp1
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%1 = fmul fast float %x, %y
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%2 = fmul fast float %y, %x
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%3 = fadd fast float %1, %2
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ret float %3
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}
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